Chemical Sensing Using a Polymer Coated Long-Period Fiber Grating Interrogated by Ring-Down Spectroscopy
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Authors
Barnes, Jack A.
Brown, Robert Stanley
Cheung, A.H.
Dreher, Marian
Mackey, G.
Loock, Hans-Peter
Date
2016-03-15
Type
journal article
Language
en
Keyword
Long-Period Grating , Fiber Optic Sensor , Cavity Ring-Down , Refractive Index Sensing , Solid-Phase Microextraction
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Abstract
An etched long-period grating was used as a refractive index sensor for vapours of four volatile organic compounds, i.e. m-xylene, cyclohexane, trichloroethylene and commercial gasoline. The sensitivity to the vapours was further increased by solid-phase microextraction into a coating made of polydimethylsiloxane (PDMS)/polymethyl-octylsiloxane (PMOS) co-polymer. By further amplification of the optical loss in an optical cavity made of two identical fiber-Bragg gratings and interrogation by phase-shift cavity ring-down spectroscopy we could detect and distinguish xylene (detection limit: 134ppm) from trichloroethylene (3300ppm), cyclohexane (1850ppm) and gasoline (10,500ppm).
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doi:10.1016/j.snb.2010.04.007